
int getenv_addr(int argc, char *argv[]) {
    char *ptr;
    if(argc < 3) {
        printf("Usage: %s <environment var> <target program name>\n", argv[0]);
        exit(0);
    }
    ptr = getenv(argv[1]); /* Get env var location. */
    ptr += (strlen(argv[0]) - strlen(argv[2]))*2; /* Adjust for program name. */
    printf("%s will be at %p\n", argv[1], ptr);
}
